n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 7 |
5 | 31 |
6 | 91 |
7 | 931 |
8 | 7441 |
9 | 38017 |
10 | 507241 |
11 | 5864761 |
12 | 43501591 |
13 | 713059711 |
14 | 10776989587 |
15 | 105784464331 |
16 | 2052437475361 |
17 | 38263122487681 |
18 | 469863736958161 |
19 | 10518597616325617 |
20 | 232980391759702951 |
21 | 3446848352553524191 |
22 | 87385257330831947851 |
[1,1,1,1,7,31,91,931,7441,38017,507241,5864761, 43501591,713059711,10776989587,105784464331, 2052437475361,38263122487681,469863736958161, 10518597616325617,232980391759702951, 3446848352553524191,87385257330831947851] |